Extension drawer-slide.



W. T. OALLAGHAN.

EXTENSION DRAWER SLIDE.

APPLICATION FILED JAN. 19, 1911.

Patented July 15, 1913.

2 SHEETSSHEET 1.

W. T. OALLA'GHAN.

EXTENSION DRAWER SLIDE.

APPLICATION FILED JAN. 19, 1911.

1,067,404, 1 Patented J111y15,1913.

2 SHEETS-31231 2.

I34 J I I," 26 Ill" J I WW j Q /n I 20 l 18 iii,

Mike-awed necessary WILLIAM T. GALLAGHAN, OFUHIGAGO, ILLINOIS.

EXTENSION DRAWEBwSLIDE.

Specification oflietters ilat'ent.

To all whom it may concern;

Be it known that I, WILLIAM T. .CALLA- GHAN, a citizen of the United States, residing at the city of Chicago, inthe county of Cook and State of Illinois, have invented a new-and useful Improvement in Extenis a specification. Y

.My invention relates to cabinets orsimit lar furniture having drawers in which papers may be filed for ready and convenient reference. It is especially applicable to filing cabinets of the vertical 0 ass. In these it is important that the drawers should open throughout theirlengthso as to disclose their entire contents. Todo this it is that they shall be supported upon extension slides which extend outwardl whenthe -.drawer is drawn'out and-.whicli return to their places-when the drawer is closed. .The slides are usually actuated by engagement with thedrawer at some portion of its travel. -Moreor less shock or noise results from the positive and sudden engagement of the parts. It is desirable that such slidesshall move at a definite. rate proportionate to that of the-drawer movement and that they will be extended or retracted in direct relation to the position of the drawer in its case or support. A mechani-' cal device for this pur se is'the subject matter of another app ication for atentwhich I now have pending in the atent Office.

The purpose of this device also is to efi'ect the object stated by cheap and ractical means. The several elements of t e structure are not liable to become disarranged. They are simple to construct and quiet and effective in operation.

The principles of my invention are illustrated in the drawings, in which- Figure 1 shows a vertical section of one side of a metal filingcabinet, together with the drawer and slides on the section line 1-1 of Fig. 2. Fig. 2 is a section of Fig. 1 on the line 22; Fig. 3 is the inner guide which is attached to the drawer; Fig. 4 is an intermediate slide, and Fig. 5 is the outer or stationary slide by means of which the drawer and the other slides are supported.

- Further describingmy invention with reference to the drawings, 1 represents the upright side of a metal filing case. 2 is a vertical guide secured thereto. It is pro- I vided with. a channel formed by the port-ion 3 and flange 4 formed-by right angle bends.

It is provided with the flanges or lips 6 and is formed on thefla slot 5,.havingthe 7-alid a similar lip.8 nge 4. A roller 9 havingthe; journals IOadapted to roll on the sion Drawer-Slides, of which the following .fla

nges 7 and 8 is placed on the said slide as shownin Figs. land 2.

The interme te slide :shown in Fig. 4 has ahead ll-whichprovides a central chantionary guide 2last-described, and the inner face. '12 of suchchanneled portion will ride .upon the roller 9.

The main-body-of said intermediate slide is provided with a downwardly ext-ended part 12, a transverse por- .tion.13,anda vertical. portion 14 at rightangles thereto,.and.1t is; provided with alon- .gitudinal slot-.15 andthe-fianges 16, 17 a and '18 inall respects similar tothe same construction shown on slide. 2. The said intermediate slidealso has a vertical portionli, a transverse portion ,at right angles thereto, and adownwandly-proj ectingz portion 18'. Thetransverseortion is providedwith slots -19 forming beet QOtherebetween, the whole forming a rack adapted 'for engagement with the teeth of a pinion as hereinafter described.

The drawer or inner guide 22 shown in Fig.3 has a vertical body portion 24, a right an is portion 25, and a downwardly turned ange 26. ()n the other edge it is turned at right angles and then downward to form the part 27. The right angle portion is provided with cuts 28 forming teeth 29 therebetween, the'whole forming a rack similar to that on the upper edge of the intermediate slide. In further assembling the device the drawer or inner guide is apmammary 15, was.

plied to the side of the drawer as shown in V Fig. 1 and the transverse portion 25 is placed under the central channel of the intermediate slide and rests upon the roller 9 which is provided with the journals 10 which roll on the flanges 17 and 18 of the intermediate slide. when the parts are thus assembled in the described re ation to each other, the drawer is supported by the intermediate slide which in turn is supported and slides upon the lation of the intermediate slide: to the drawer in action willbe that of chance only or as governedby accidental friction. But

It will be seen that .outer or stationary guide, but that the re- 1 I use the double pinion consisting of the largemember 30 and the small member 31, which are securely fastened together and attached by the pivot 32 to the stationary part of the cabinet frame. The larger member as shown has twice the number of teeth on its periphery that the smaller member has. The composite pinion should be so placed that the teeth of the larger member mesh with the rack on the upper edge of the drawer guide, and the .teeth of the smaller member mesh with the teeth or forming the rack on the upper edge of the intermediate slide. When so placed and when the teeth on the two members of the pinion are in the relation to each other of two to one, it is clear that when the drawer is extended the action of the pinion will extend the intermediate slide to just half the distance that he drawer itself has moved, and that all movements of the parts'will be in like relation. And, by varying the number of teeth on the pinion, any desired relation of movement between the slide and the drawer may be secured.

I claim:

1. In a cabinet having a vertical wall, an angular guide secured therein, an intermediate single piece sheet metal slide having three oppositely opening longitudinal depressions therem and providedewith a top rack, a drawer guide provided with a rack at its top, said slide and guide provided with longitudinally extending slots and terminal flanges, antifriction rollers journaled in.

said slots and upon said flanges, said drawer guide adapted to ride upon the roller of noemoa I the intermediate slide and the latter upon the roller of the cabinet guide, a two-stepped pinion rotatably secured to said cabinet guide and adapted to mesh. with the said racks.

-2. In a cabinet having a vertical wall, an angular guide secured therein, an intermediate single piece slide having three oppositely opening longitudinal depressions vtherein and provided with a top rack cut therefrom, a drawer guide provided with a rack at its top, said slide and guide each I having a short length slot adjacent its lower front corner and also havin a flanged lower edge positioned in horizonta alinem'ent with the adjacent slot, anti-friction rollers movably journaled in each of said slots and revolubly mounted upon said flanged edges, said drawer'guide adapted to ride upon the roller of the intermediate slot and the intermediate slide adapted to ride upon the roller of the cabinet guide, a two stepped pinion rotatably secured to said cabinet guide and adapted to mesh with said racks, one step of said pinion having twice the number of teeth provided upon the other step thereof and the teeth of the smaller step positioned in meshing engagement with the intermediate slide rac In witness whereof, I have hereunto set my hand, this 7th day of January A. D. 1911, in the presence of two subscribing witnesses. 

